JAMA Oncol:共存突变可影响 EGFR-TKIs的疗效

2018-04-02 肿瘤资讯 肿瘤资讯

截至目前,已经有10个随机对照III期临床试验证实:对于表皮生长因子受体(EGFR)基因突变的晚期非小细胞肺癌(NSCLC)患者,EGFR-TKIs的疗效显着优于传统化疗。然而对于这些病人,仍有20%~30%出现原发耐药、甚至快速进展,其具体的机制并未完全清楚。来自中山大学肿瘤防治中心的张力教授团队开展了一项队列研究,旨在探讨共存突变(Concomitant mutation)对EGFR-TKIs

截至目前,已经有10个随机对照III期临床试验证实:对于表皮生长因子受体(EGFR)基因突变的晚期非小细胞肺癌NSCLC)患者,EGFR-TKIs的疗效显着优于传统化疗。然而对于这些病人,仍有20%~30%出现原发耐药、甚至快速进展,其具体的机制并未完全清楚。来自中山大学肿瘤防治中心的张力教授团队开展了一项队列研究,旨在探讨共存突变(Concomitant mutation)对EGFR-TKIs疗效的影响。相关研究结果于2018-03-29在线发表在JAMA Oncology。

开展基于二代测序液体活检的队列研究

既往研究认为,EGFR突变NSCLC是单个癌基因驱动的肿瘤,因此,关闭驱动基因活化的关卡,便可精准杀灭肿瘤细胞。对于EGFR驱动基因突变的晚期NSCLC患者,EGFR-TKIs已经是国际指南推荐的一线治疗方案。然而多个研究结果发现,即使携带敏感突变,仍有部分患者初始疗效差,表现为原发耐药,严重限制了患者的长期生存。为了揭示EGFR-TKIs原发耐药的分子机制,张力教授团队开展了这项基于二代测序液体活检的队列研究,详细分析了循环肿瘤DNA(ctDNA)突变谱与EGFR-TKIs疗效的关系。

共存突变削弱EGFR-TKIs疗效

该研究纳入了58例EGFR突变并接受EGFR-TKI治疗的晚期NSCLC患者,利用高通量二代测序技术,检测TKI治疗前ctDNA的突变状况,重点分析了共存突变与患者临床病理学特征、疗效及生存期的关系。研究结果发现,58例患者中,有13例(22%)患者存在EGFR多重突变,其中合并EGFR T790M突变者8例(14%)。进一步分析发现,55%的患者存在EGFR基因以外的基因改变(共存突变)。共存突变在EGFR 21号外显子突变的患者中的频率显着高于EGFR 19号外显子缺失突变者(69% vs. 41%; P=0.04);在吸烟患者中的发生率也显着高于不吸烟的患者(91% vs. 47%)。疗效及生存分析发现,合并共存突变的患者,其客观缓解率(44% vs 77%)、中位PFS(6.20 vs. 18.77个月)和中位总生存(22.70个月 vs. 未达到)均显着差于不合并共存突变的患者。经多因素分析校正EGFR突变亚型及患者的临床病理学特征后,共存突变仍然是预后的独立预测因子。

结论:由于既往肺癌TCGA测序研究是在早期患者(手术标本)中进行,研究结果普遍认定EGFR突变与其他驱动基因互斥。但肿瘤的异质性及在晚期患者高度基因组学不稳定的情况下,EGFR基因是否还那么“单纯美好”?张力教授领衔的这个研究告诉我们事实并非如此。该研究结果发现超过一半的EGFR突变患者合并抑癌基因及癌基因改变,并且与EGFR-TKIs更差的疗效相关。此外,该研究还发现EGFR 21号外显子突变的患者合并共存突变的比例更高,可能是这部分患者疗效差于19号外显子缺失突变的潜在机制,值得进一步探讨。这个研究揭示了多重基因测序对于NSCLC精准治疗的重要性。下一步需要通过设计联合或序贯治疗临床试验,以期逆转共存突变患者的不良预后。

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    2018-10-19 hbwxf
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    2019-03-17 yhj-time
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    2019-03-12 minlingfeng
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    2018-04-04 lsj628
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    2018-04-04 liuyiping
  7. [GetPortalCommentsPageByObjectIdResponse(id=1940475, encodeId=6f8c19404e5fa, content=<a href='/topic/show?id=7ed165e3b6' target=_blank style='color:#2F92EE;'>#EGFR-TKIs#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=34, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=6573, encryptionId=7ed165e3b6, topicName=EGFR-TKIs)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=55ce62, createdName=hbwxf, createdTime=Fri Oct 19 14:09:00 CST 2018, time=2018-10-19, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1795737, encodeId=b2581e95737c0, content=<a href='/topic/show?id=2f311e504f6' target=_blank style='color:#2F92EE;'>#TKIs#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=42, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=17504, encryptionId=2f311e504f6, topicName=TKIs)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=37d0457, createdName=yhj-time, createdTime=Sun Mar 17 16:09:00 CST 2019, time=2019-03-17, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1865400, encodeId=e0c8186540098, content=<a href='/topic/show?id=16ce133504e' target=_blank style='color:#2F92EE;'>#Oncol#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=40, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=13350, encryptionId=16ce133504e, topicName=Oncol)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=b63894, createdName=minlingfeng, createdTime=Tue Mar 12 04:09:00 CST 2019, time=2019-03-12, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1383068, encodeId=0af3138306843, content=<a href='/topic/show?id=0c8265e2b3' target=_blank style='color:#2F92EE;'>#EGFR-TKI#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=39, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=6572, encryptionId=0c8265e2b3, topicName=EGFR-TKI)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=6732482, createdName=w984445tii, createdTime=Wed Apr 04 04:09:00 CST 2018, time=2018-04-04, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1384186, encodeId=cf8e138418697, content=<a href='/topic/show?id=14bb1e503a0' target=_blank style='color:#2F92EE;'>#TKI#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=25, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=17503, encryptionId=14bb1e503a0, topicName=TKI)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=b73f484, createdName=lsj628, createdTime=Wed Apr 04 04:09:00 CST 2018, time=2018-04-04, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1534376, encodeId=0bcd15343e67b, content=<a href='/topic/show?id=22b3e9887e' target=_blank style='color:#2F92EE;'>#GFR#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=29, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=7988, encryptionId=22b3e9887e, topicName=GFR)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=f0a812532020, createdName=liuyiping, createdTime=Wed Apr 04 04:09:00 CST 2018, time=2018-04-04, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1031709, encodeId=a6321031e099d, content=谢谢梅斯提供这么好的信息,学到很多, beContent=null, objectType=article, channel=null, level=null, likeNumber=39, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=f0620, createdName=内科新手, createdTime=Mon Apr 02 16:09:00 CST 2018, time=2018-04-02, status=1, ipAttribution=)]
    2018-04-02 内科新手

    谢谢梅斯提供这么好的信息,学到很多

    0

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